An algorithm is developed for the quick estimation of the fraction of annual heat-load that is covered by geothermal energy in district-heating systems. The cases of direct use, heat exchange and heat-pump application are distinguished. The algorithm proved accurate enough for pre-feasibility...

Optimization of biogas production from olive-mill wastewater (OMW) was attempted by codigesting with diluted poultry-manure (DPM) at mesophilic conditions. A series of laboratory experiments were performed in continuously-operating reactors, fed with mixtures of OMW and DPM at various...